Thats a trouble code that the units not seeing the disc. Your gonna have to clean the laser lens and see if that helps as there could be a film over it. If that dosent help then your gonna have to take the unit in for service. Good Luck

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Try checking for dust on the laser eye, A fine, clean and very soft artists brush will do for cleaning or perhasp the CD has a miniscule scratch on the surface. You'll know if it is a scratch as the CD will always stop in the same place. CD's and DVD's should only be wiped clean with a very clean duster in the direction of from the centre hole to the outer rtim of the disc. Never ever wipe anything across the whole surface from one side to the other or wipe in a circular motion. There a quite a few products on the market that will help you keep you discs clean. Just google CD (or DVD) cleaner. CD's and DVD's are quite forgiving in how badly scratched they can be and still play. It only takes a small scratch or dent that can only be seen under magnification to deflect the laser beam off track.

sounds like the amplifier but it could just be a loose connection if its a 6 cd player under the seat away from the radio if the radio works then its a connection problem as its showing what track and what cd its playing

I had it too. - when I bought the used vehicle and was elated that it had a Jensen sound system in it. The sound was good - played a CD the first time I put it in. We listened to the radio after an hour and then attempted to replay the same CD. The ER-4 message showed up. The man who sold me the vehicle had given me the paperwork on the unit and I reset it. I've had to do this at least 4 times which means you have to reset all your favorite stations, time, etc.